Combined protractor and rule.



w. s. ADAMS. GOMBINED PROTRAUTOB AND RULE.

APPLIOATION FILED SEPT. 12, 1904.

Patented Aug 8, 1911.

UMBM FLANOGMPH 00-. WASHINGTON. D. C.

STATS PATEN OFFTQE.

WILSON S. ADAMS, OF LANSING, KANSAS, ASSIGNOR OF ONE-THIRD T0 HARRY J.ADAMS, OF KANSAS CITY, MISSOURI.

COMBINED PROTRACTOR AND RULE.

To all whom it may concern:

Be it known that I, WILSON S. ADAMS, a citizen of the United States,residing in Lansing, in the county of Leavenworth and State of Kansas,have invented a new and useful Improvement in Combined Protractors andRules, of which the following is a specification, reference being had tothe accompanying drawings, forming a part thereof.

My invention relates to improvements in combined folding rules andprotractors.

The object of my invention is to provide in one instrument a foldingpocket rule and a protractor.

lVith the use of my invention ordinary running measurements may betaken, as, for instance, the length of a rafter, and with the sameinstrument different angles may be located, as for instance, the plumbout of a rafter.

In the accompanying drawings illustrating my invention Figure 1 is anenlarged plan view of the inner pivoted ends of the inner members,showing the radial graduations on one member. Fig. 2 is a cross sectiontaken on the dotted line 2-2 of Fig. 1. Fig. 3 is a perspective view ofthe device partly folded. Fig. 4 is a plan view of the instrument partlyfolded. Fig. 5 is a plan view of the instrument fully extended.

Similar characters of reference denote I similar parts.

In the drawings I have illustrated an ordinary carpenters rule providedwith the protractor feature. The rule comprises two inner members 1 and2, the inner end of the member 1 having two arcuate extensions 3 and 4,the center of the arcuate extensions being also the pivotal center ofthe two inner members. The two arcuate extensions 3 and 4 are parallelwith each other and have mounted between them the arcuate extension 5 ofthe member 2. A pivot pin 6 extends through the extensions 3, 4 and 5 inthe pivotal center corresponding to the centers of said arouateextensions. One side of the extension 3 is provided with a series ofgraduations 7 located radially relative to the pivotal center or axis ofthe pin 6. These graduations 7 may be provided with characters denotingSpecification of Letters Patent.

Application filed September 12, 1904.

Patented Aug. 8, 1911.

Serial No. 224,060.

different degrees. The inner edge 8 and a portion of the end edge 9 ofthe member 1 are disposed at right angles to each other and alsoradially relative to the axis of the pin 6. In a like manner are locatedthe inner edge 10 and aportion of the end edge 11 of the member 2. Thusby swinging the members 1 and 2 upon the pivot pin 6, the edges 10 and11 may be employed as indicators for the radial graduations 7 on theextension 3, and as both edges always indicate at one time graduationsof the same value, either edge may be used as the indi cator.

When the edges 8 and 10 form an obtuse angle, the graduations indicateddenote the angle between the edges 9 and 11. When the edges 8 and 10form an acute angle the graduations indicated denote the angle betweenthe edge 10 and the plane of the edge 9, and also the angle between theedge 11 and the plane of the edge 8.

12 denotes the ordinary transverse graduations on the sides of thediflerent members and denoting units of measurement and divisionsthereof.

To the outer ends of the inner members 1 and 2 are pivoted respectivelythe inner ends of the outer members 13 and 14, the axes of the saidpivotal connections being disposed at right angles to the pin 6, wherebythe rule may be folded first t0 the position shown in Fig. 4 and then inthe position shown in Fig. 3.

In operating my invention, the instrument is used, in measuring 01fdistances, in the ordinary manner, the rule being extended for thispurpose, as shown in Fig. 5. To lay off a plumb cut with the edge 11,place the side edge 8 of member 1 parallel with one side edge of arafter and swing the member 2 to a position in which the edge 10 will beat an obtuse angle to the edge 8 and in which the edge 10 indicates theproper graduation denoting the pitch of the roof, as for example, themiddle one of the graduations 45, as shown in Fig. 1. Both edges 10 and11 will now indicate graduations of like value, and a line struck on therafter along the edge 11 will denote the plumb out for a roof of 45pitch. Or by swinging the member 2 so that the edges 8 and 10 form anacute angle and the edges 10 and 11 indicate graduations 45, the plumbout may be denoted by striking a line on the rafter along the edge 10.

Very often it is desired to lay off a line at a certain given angle andthen measure a certain distance along the said line, as for instancewhere it is desired to notch, at a certain angle and for a given depth,a piece of timber. To do this, the member 1 is placed on the piece oftimber with the outer or graduated edge 01": member 1 disposed parallelwith the side of the piece in which it is desired to make the notch. Themember 2 is then swung until the edge 10 indicates the angle desired, asfor instance t5 after which a line is drawn along the outer or graduatededge of the member 2 from the edge 11 to the graduation denoting thelength required for the notch, as for instance the graduationrepresented by the numeral 11 in Fig. 1. A line 0-(Z may then be laidoff at right angles to the outer edge of member 2. By sawing out thepiece so laid out, a notch having the proper angle and depth may beobtained.

The examples just given represent but two of many ditl'erent uses towhich the instrument may be applied.

My invention may be variously modified without departing from itsspirit.

Having thus described my invention what I claim and desire to secure byLetters Patent, is

A combined protractor and rule compris ing two transversely graduatedmembers one having two arcuate extensions between which is pivotallymounted an arcuate extension provided on the other member, the pivotalconnection between the members being intersected by the adjacent end andside edges of both members, oneof the outer extensions being radiallygraduated three fourths of its circumference in three segments of ninetydegrees each, the graduations of all the segments being numbered alikeand in a like direction whereby the end and side edges of the arm havingthe single arcuate extension will, at any angle to which the arms may beswung, be in alinement with graduations of adjacent segments having likenumbers.

In testimony whereof I have signed my name to thisspecification inpresence of two subscribing witnesses.

\VILSON S. ADAMS. l/Vitnesses:

VVAnRnN D. HOUSE, HENRY F.Rosn.

Copies of this patent may be obtained for five cents each, by addressing:the Commissioner of Patents, Washington, D. C.

